Wireless Power Charging System

ABSTRACT

A wireless power charging system has a wireless power transmission apparatus formed to charge a plurality of wireless power receiving apparatuses located in a short distance therefrom, wherein the total charging time for the wireless power receiving apparatuses is saved. The wireless power transmission apparatus has a main control unit and a resonant converter unit, which transmit the electric signal to the wireless power receiving apparatus via the resonance signal generated from a primary charge core in order to charge the wireless power receiving apparatuses. The wireless power transmission apparatus also includes an output signal conversion module for transmitting a converted electric signal to the resonant converter unit and a received signal process module for processing a signal transmitted from the wireless power receiving apparatus.

CLAIM OF PRIORITY

This application claims the benefit of Korean Patent Application No.10-2007-0123750 filed on Nov. 30, 2007, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wireless power charging system, andmore particularly, to a short-distance wireless power charging system,which has a wireless power transmission apparatus formed to charge aplurality of wireless power receiving apparatuses located in a shortdistance therefrom, wherein the total charging time for a plurality ofwireless power receiving apparatuses can be saved.

2. Description of the Related Art

Portable electronic devices, such as cellular phones, personal digitalassistants (PDAs), portable media players (PMPs), digital multimediabroadcasting terminal (DMB terminals), MPEG audio layer 3 (MP3) playersor notebook computers, cannot be plugged into the regular power at homeor office since they are generally used while the users are moving.Accordingly, the portable electronic devices are equipped with batteriesor rechargeable batteries.

A charging system has been used to charge electric power, supplied froma regular power source, to the batteries or a battery pack of theportable devices via power supply lines or power supply connectors.However, when the charger and the batteries are connected ordisconnected to replenish the electric power of the batteries with thisconnector supply system, an instant discharge may happen because of thepotential differences between the charger connector and the batteryconnector. Hence the foreign substances will be gradually gathered onboth connectors and finally there may be a fire disaster. Further, thecollected humidity thereon will cause the discharge of the battery andother problems will be involved like the declining battery life, the lowbattery quality, and so on.

To solve the above-mentioned problems of the charging system using thepower supply connectors, non-contacting charging systems have beendeveloped. In this non-contacting charging system in accordance with theprior art, the device having the battery to be charged is placed overthe primary coil of the non-contacting charging system and the batterywill be charged by the secondary coil of the battery. The battery ischarged with the induced electricity from the induced electromotiveforce of the secondary coil by the generated magnetic field from theprimary coil.

The conventional non-contacting charging systems with the prior art canonly be used to supply the electricity to the portable devices. Thereare limited practical uses because they cannot be used in variousalternatives.

Besides, if a metal is placed inside the effective radius of thegenerated magnetic field of the primary coil, there would be a lot lossof the electricity in the primary coil and non-contacting chargingsystem may be damaged.

SUMMARY OF THE INVENTION

To solve the above-mentioned problems, the present invention is directedto a wireless power charging system formed to charge a plurality ofwireless power receiving apparatuses placed in a short distance from awireless power transmission apparatus, wherein the total charging timefor a plurality of wireless power receiving apparatuses will be saved.

Moreover, when a plurality of wireless power receiving apparatuses arefully charged, the wireless power transmission system will beautomatically changed to a standby mode, wherein the initial pulsesignal is sending out. By doing so, the charging efficiency will bemaximized while the loss of the electricity will be minimized.

According to an aspect of the present invention, there is provided awireless power charging system for charging one or a plurality ofwireless power receiving apparatuses in a short distance from a wirelesspower transmission apparatus. The wireless power transmission apparatusincludes a power transmission apparatus case as an outside body housinga main control unit and a resonant converter unit, which transmit anelectric signal to one or via a resonance signal generated from aprimary charge core; an output signal conversion module for transmittingthe converted electric signal to the resonant converter unit by thecontrol signal from the main control unit; and a received signal processmodule, which processes a signal transmitted from the wireless powerreceiving apparatus via the primary charge core and sends the processedsignal out to the main control unit.

Hereupon the resonant converter unit may include an R-L-Cseries-parallel resonant converter.

The power transmission apparatus case may include a power on/off switchon the front side thereof; an input panel for signal input; and adisplay panel showing the charging status of the wireless powerreceiving apparatus and normal/abnormal status of the wireless powertransmission apparatus. The power transmission apparatus furtherincludes a power supply unit installed inside the power transmissionapparatus case.

The main control unit may include a power supply block connected withthe power supply unit for the power supply to the wireless powertransmission apparatus; a signal output block for sending the displaysignal to show the status on a display panel; a gate output signalprocess block coupled with an output signal conversion module fortransmitting a power signal transferred from the primary charge core; areceived signal process block for processing a signal transmitted from areceived signal process module, which processes the signal transmittedfrom the wireless power receiving apparatus; and a main controller whichcontrols the power supply block, the signal output block, the gateoutput signal process block, and the received signal process block.

Furthermore, the wireless power receiving apparatus may include asecondary charge core fronting the primary charge core of the wirelesspower transmission apparatus in order to receive the power signal viathe resonant with the magnetic field; a received power signal conversionmodule connected with the secondary charge core for converting thereceived power signal; a charge circuit block linked with the receivedpower signal conversion module in order to charge the battery cell; aprotection circuit block formed between the charge circuit block and thebattery cell for detecting the charged current into the battery cell andsending the charging status of the battery cell to the wireless devicecontrol module; a voltage regulator block for the power supply to thewireless device control module; and a wireless device control module,which controls the received power signal conversion module, the chargecircuit block, the protection circuit block, and the voltage regulatorblock.

The present invention formed with the above-mentioned figures isconstructed to charge a plurality of wireless power receivingapparatuses located in a short distance from the wireless powertransmission apparatus, wherein the advantageous effect is that thetotal charging time for a plurality of wireless power receivingapparatuses can be saved.

Moreover, when a plurality of wireless power receiving apparatuses arefully charged, the wireless power transmission system will be changed toa stand-y mode where the initial pulse signal is sending out. By doingso, the charging efficiency will be maximized while the loss of electricpower will be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a schematic configuration view of a wireless power chargingsystem in accordance with the present invention;

FIG. 2 is a block diagram of a wireless power transmission apparatus inaccordance with the present invention;

FIG. 3 is a block diagram of a wireless power receiving apparatusaccording to the present invention; and

FIG. 4 is a flow diagram of a conceptual transmission control processfor the wireless power charging system in accordance with the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The invention will now be described in detail with reference to theaccompanying drawings.

FIG. 1 is a schematic configuration view of a wireless power chargingsystem in accordance with the present invention, FIG. 2 is a blockdiagram of a wireless power transmission apparatus in accordance withthe present invention, FIG. 3 is a block diagram of a wireless powerreceiving apparatus according to the present invention, and FIG. 4 is aflow diagram of a conceptual transmission control process for thewireless power charging system in accordance with the present invention.

Referring to FIGS. 1 to 4, a wireless power charging system A is formedwith a wireless power transmission apparatus 10 to transmit the powersignal for charging one or a plurality of wireless power receivingapparatuses 30 located in a short distance from the wireless powertransmission apparatus 10.

The wireless power transmission apparatus 10 includes a powertransmission apparatus case 11 as an outside body, housing therein amain control unit 21 and a resonant converter unit 23, which transmit anelectric signal to the wireless power receiving apparatus 30 via aprimary charge core 13; an output signal conversion module 22 fortransmitting a converted electric signal to the resonant converter unit23 by a control signal from the main control unit 21; and a receivedsignal process module 24, which processes a signal transmitted from thewireless power receiving apparatus 30 via the primary charge core 13 andsends the processed signal out to the main control unit 21.

The resonant converter unit 23 includes an R-L-C series-parallelresonant converter. As shown in FIG. 1, the magnetic field is generatedaccording to the electromagnetic resonance by the resonant converterunit 23 and the primary charge core 13. With this process, the powersignal is ready to be sent to the wireless power receiving apparatuses30 located in a short distance from the wireless power transmissionapparatus 10.

The power transmission apparatus case 11 (of the power transmissionapparatus 10) includes a power on/off switch on the front side thereof;an input panel for signal input; and a display panel 14 showing thecharging status of the wireless power receiving apparatus 30 andnormal/abnormal status of the wireless power transmission apparatus 10.Inside the power transmission apparatus case 11, a power supply unit 25is installed. Therefore, the operator can use the wireless powercharging system A according to the displayed messages on the displaypanel 14 of the wireless power transmission apparatus 10.

The main control unit 21 of the wireless power transmission apparatus 10may include a power supply block 211 coupled with the power supply unit25 for the power supply to the wireless power transmission apparatus 10;a signal output block 212 for sending the signal to show the status on adisplay panel 14; a gate output signal process block 213 coupled with aoutput signal conversion module 22 for transmitting the transferredpower signal from the primary charge core 13; a received signal processblock 214 for processing the transmitted signals from a received signalprocess module 24 which processes the transmission signal from thewireless power receiving apparatus 30; and a main controller 210 whichcontrols the power supply block 211, the signal output block 212, thegate output signal process block 213, and the received signal processblock 214.

Furthermore, the wireless power receiving apparatus 30 may include asecondary charge core 32 fronting the primary charge core 13 of thewireless power transmission apparatus 10 in order to receive the powersignal via the resonant with the magnetic field; a received power signalconversion module 33 connected with the secondary charge core 32 forconverting the received power signal; a charge circuit block 36 linkedwith the received power signal conversion module 33 in order to chargethe battery cell 35; a protection circuit block 37 formed between thecharge circuit block 36 and the battery cell 35 for detecting thecharged current into the battery cell 35 and sending the charging statusof the battery cell 35 to the wireless device control module 39; avoltage regulator block 38 for the power supply to the wireless devicecontrol module 39; and a wireless device control module 39 whichcontrols the received power signal conversion module 33, the chargecircuit block 36, the protection circuit block 37, and the voltageregulator block 38.

The wireless power receiving apparatus 30 can be included inside theportable electronic devices, for example, cellular phones, PDAs, PMPs,DMB terminals, MP3s or notebook computers.

With the wireless power charging system A, the power signal can betransmitted to the secondary charge core 32 of the wireless powerreceiving apparatus 30 by the resonance signals according to theelectric field and magnetic field transferred from the primary chargecore 13 although the wireless power receiving apparatus 30 is severalmeters apart from the wireless power transmission apparatus 10.

The secondary charge core 32 of the wireless power receiving apparatus30 collects the power signals, which are the resonant signals by theelectric field and magnetic field, and can be made of the materials liketitanium dioxide (TiO2, dielectric constant 96), barium tetratitanate(BaTi4O9, dielectric constant 37), and lithium tantalite (LiTaO3,dielectric constant 40).

For the secondary charge core 32 corresponding to a power receivingantenna for the resonant signals, it is better to use the materials withthe small loss according to the dielectric constant.

The wireless power charging system A with above-mentioned figures inaccordance with the present invention is to transmit the power signal,as the resonant signal by the electric field and the magnetic field, toone or a plurality of wireless power receiving apparatuses 30. It is anadvantage that the charging operation is still possible despite theincreased or decreased numbers of the wireless power receivingapparatuses 30, even though the wireless power transmission apparatus 30is sending out the same amount of the resonant signals.

If there is no wireless power receiving apparatus 30 in the near area;the power receiving apparatus 30 is placed in close proximity and startsbeing charged for the first time; or a changed condition happens likeone or a plurality of wireless power receiving apparatuses 30 are fullycharged and charging is stopped, the wireless power charging system Aneeds to be designed to transfer these information to the wireless powertransmission apparatus 10 which operates properly in accordance with thereceived information.

As shown in FIG. 4, the wireless power charging system A will be changedto a standby mode stage S01, in which the charging operation will bestopped if there is no wireless power receiving apparatuses 30 near thewireless power transmission apparatus 10. At the standby mode stage S01,this system is regularly sending out the pulse signal by thepredetermined cycle and detects if any wireless power receivingapparatuses 30 are approaching within several meters. When anyapproaching wireless power receiving apparatuses 30 are detected withinseveral meters, the system will start sending out the charging power.

Before sending out the charging power, the system will perform a motiondetecting stage S02 at first to check if the approaching objects areproperly working wireless power receiving apparatuses 30.

In the standby mode stage S01, together with the pulse signal, thesystem will send out the signal asking for the unique ID data signal ofthe wireless power receiving apparatus 30. Next step is to perform aunique ID recognition stage S03 to recognize if the wireless powerreceiving apparatus 30 is the proper one for the charging operation withthe received signal from the wireless power receiving apparatus 30.

When it is recognized as a properly working wireless power receivingapparatus 30 with a properly recognized unique ID, the system will startworking the charging operation in a power transmission stage S04.

During the power transmission stage S04, the system can send out aunique code as an initial signal. This unique code is to recognize thestatus of the charged power and the condition of the equipment for everywireless power receiving apparatus 30 when a plurality of wireless powerreceiving apparatuses 30 are connected and being charged with thewireless power charging system A at the same time. The data value of theunique ID for each wireless power receiving apparatus 30 can be changedto a code value and this code value can be used for sending/receivingdata for the unique ID of the wireless power receiving apparatus 30instead.

When a plurality of wireless power receiving apparatuses 30 areconnected and being charged at the same time, the system can be adaptedto send out each status of the charged power and the condition of theequipment for every wireless power receiving apparatus 30 and controlthe charging amount at each charging stage in a charge controlling stageS05.

When a wireless power receiving apparatus 30 is fully charged accordingto the status of the charged power, the charging operation is controlledto stop working although the specific power signal for the wirelesspower receiving apparatus 30 is received.

When all the wireless power receiving apparatuses 30 are fully charged,a fully charged stage S06 will be performed to stop working the wirelesspower transmission apparatus 10.

Hence, the wireless power charging system A stops working the chargingoperation. The system is changed to the standby mode stage S01 and thewireless power transmission apparatus 10 is continuously sending out thepulse signal to detect another wireless power receiving apparatus 30 tobe charged.

While the present invention has been shown and described in connectionwith the preferred embodiments, it will be apparent to those skilled inthe art that modifications and variations can be made without departingfrom the spirit and scope of the invention as defined by the appendedclaims.

1. A wireless power charging system for charging one or a plurality ofwireless power receiving apparatuses in a short distance from a wirelesspower transmission apparatus, wherein the wireless power transmissionapparatus comprises: a power transmission apparatus case as an outsidebody housing a main control unit and a resonant converter unit, whichtransmit an electric signal to the wireless power receiving apparatusvia a resonance signal generated from a primary charge core; an outputsignal conversion module for transmitting the converted electric signalto the resonant converter unit by the control signal from the maincontrol unit; and a received signal process module, which processes asignal transmitted from the wireless power receiving apparatus via theprimary charge core and sends the processed signal out to the maincontrol unit.
 2. The wireless power charging system according to claim1, wherein the resonant converter unit includes an R-L-C series-parallelresonant converter.
 3. The wireless power charging system according toclaim 1, wherein the power transmission apparatus case includes: a poweron/off switch on a front side thereof; an input panel for signal input;and a display panel showing the charging status of the wireless powerreceiving apparatus and normal/abnormal status of the wireless powertransmission apparatus, and wherein the power transmission apparatusfurther comprises a power supply unit installed inside the powertransmission apparatus case.
 4. The wireless power charging systemaccording to claim 1, wherein the main control unit includes a powersupply block connected with the power supply unit for power supply tothe wireless power transmission apparatus; a signal output block forsending a signal to show the status on a display panel; a gate outputsignal process block coupled with an output signal conversion module fortransmitting a power signal transferred from the primary charge core; areceived signal process block for processing a signal transmitted from areceived signal process module, which processes the signal transmittedfrom the wireless power receiving apparatus; and a main controller whichcontrols the power supply block, the signal output block, the gateoutput signal process block, and the received signal process block. 5.The wireless power charging system according to claim 1, wherein thewireless power receiving apparatus includes: a secondary charge corefronting the primary charge core of the wireless power transmissionapparatus in order to receive a power signal via the resonant with themagnetic field; a received power signal conversion module connected withthe secondary charge core for converting the received power signal; acharge circuit block linked with the received power signal conversionmodule in order to charge the battery cell; a protection circuit blockformed between the charge circuit block and the battery cell fordetecting the charged current into the battery cell and sending thecharging status of the battery cell to the wireless device controlmodule; a voltage regulator block for the power supply to the wirelessdevice control module; and a wireless device control module, whichcontrols the received power signal conversion module, the charge circuitblock, the protection circuit block, and the voltage regulator block.